Antenna Array Calibration for Wireless Charging Phase Coherency
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Solution Overview
Problem
The increasing demand for higher processing capabilities in mobile communication devices leads to more complex integrated circuits that consume more battery power, making it challenging to prolong battery life and requiring high-capacity, expensive batteries that often need to be recharged during the day.
Innovation Solution
A wireless charging station with a plurality of antenna elements that undergoes an initial calibration sequence and training sequence to achieve phase coherency among the antenna elements, optimizing wireless charging power efficiency by adjusting relative phase errors and transmitter phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple antenna elements are used for wireless charging, then charging power and efficiency are improved, but phase errors among antenna elements reduce charging efficiency
Solution Approach 1:
The system performs calibration sequences before actual wireless charging operations to determine and correct phase errors in advance. The initial calibration sequence establishes baseline phase relationships, and the training sequence fine-tunes these relationships, ensuring that when charging begins, all antenna elements are properly synchronized for maximum efficiency.
Solution Approach 2:
The system uses feedback from calibration measurements to adjust phase shift circuitry settings. During calibration, the system measures phase errors between antenna elements and uses this feedback information to configure the phase shift circuitry, creating a closed-loop system that optimizes charging efficiency before operation.
2Loss of energy
If phase calibration is performed, then charging efficiency is improved, but system complexity and calibration time increase
Solution Approach 1:
The calibration process is divided into distinct segments: an initial calibration sequence that runs when the system is first powered on, and a training sequence that can be performed subsequently. This segmentation allows the complex calibration task to be broken into manageable parts, with the initial calibration establishing basic phase relationships and the training sequence providing refinements.
Solution Approach 2:
The initial calibration sequence is performed in advance during system initialization, establishing baseline phase relationships before the system enters normal operation. This preliminary action ensures that the more time-sensitive training sequence can be executed efficiently during actual charging operations.
3Productivity
If antenna elements are not calibrated, then system operation is simpler and faster, but wireless charging power efficiency decreases
Solution Approach 1:
Calibration is performed as a preliminary action during system initialization or before charging sessions, separating the calibration task from the charging operation itself. This allows the charging process to proceed efficiently without interruption from calibration activities, while still ensuring optimal power transfer when charging begins.
Solution Approach 2:
The system performs self-calibration using built-in test signals and measurement capabilities, eliminating the need for external calibration equipment or manual adjustment. The phase shift circuitry automatically adjusts based on measurements taken during calibration sequences, making the system self-sufficient and reducing operational complexity.
Data Source
AI summary
Antenna array calibration for wireless charging is disclosed. In one aspect, an initial calibration sequence is performed each time a wireless charging station is powered on. The initial calibration sequence utilizes a reference antenna element, which is an antenna element randomly selected from a plurality of antenna elements in the wireless charging station, to determine relative receiver phase errors between the reference antenna element and each of the other antenna elements in an antenna array. In another aspect, a training sequence is performed after completing the initial calibration sequence to determine total relative phase errors between the reference antenna element and each of the other antenna elements in the antenna array. Adjustments can then be made to match respective total relative phase errors among the plurality of antenna elements to achieve phase coherency among the plurality of antenna elements for improved wireless charging power efficiency.